Heat insulation cushion pad, battery and electric device
Through the alternately stacked expansion layer and the thermal insulation buffer pads of the cooling layer, the problem of temperature reduction and high detector cost before the battery thermal runaway is solved, and the battery safety and performance improvement is achieved.
Patent Information
- Application Number
- CN202422037507.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The prior art cannot reduce the temperature before the battery is thermally out of control, and high-cost fire detectors are prone to thermally out of control diffusion and high operation and maintenance costs.
The thermal insulation buffer pad of the alternate layer of expansion and cooling layer is adopted. The expansion layer is used to absorb heat and expand and isolate it. The cooling layer is used to absorb heat and cool it down. The material is perfluorohexanone and silicone, and the thickness is controlled within 3mm.
Effectively prevent the battery from getting out of control, reduce heat transfer between the battery cells, reduce battery cell temperature, improve battery performance and reduce production costs.
Smart Images
Figure CN223266420U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a thermal insulation cushion, a battery, and an electrical device. Background Art
[0002] To prevent thermal runaway fires from spreading between cells within the battery compartment and potentially causing uncontrollable consequences, large-scale storage projects currently employ firefighting solutions that typically include pack-level fire detection, compartment-level fire detection, and fire alarm and exhaust activation after coordinated firefighting, or pack / compartment-level fire suppression and explosion control. This solution enables pack-level thermal runaway detection of battery cells, offering advantages such as early detection, timely fire extinguishing, and effective fire suppression. However, this solution still suffers from the inability to reduce battery temperatures before thermal runaway occurs in individual cells, and therefore cannot completely prevent thermal runaway.
[0003] Furthermore, this solution requires detectors to be placed in every battery cell, a large number of which significantly increases costs. Furthermore, currently, batteries often use combined combustible gas and smoke temperature detectors for detection. These detectors offer advantages such as high accuracy, fast response, and low false alarm rates. However, they often detect only after a significant amount of smoke or combustible gas has been released from the battery cell, which can easily lead to thermal runaway between battery modules and incurs high maintenance costs. Utility Model Content
[0004] The purpose of this application is to provide a thermal insulation buffer pad, a battery and an electrical device to address the deficiencies in the above-mentioned prior art, which can prevent the occurrence of thermal runaway in a timely manner and improve the electrical performance of the battery.
[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:
[0006] According to a first aspect of an embodiment of the present application, a thermal insulation cushion is provided, comprising: expansion layers and cooling layers alternately stacked, wherein the number of the expansion layers is one more than the number of the cooling layers.
[0007] Optionally, the number of the expansion layers is two, and the number of the cooling layer is one.
[0008] Optionally, the cooling layer absorbs heat by volatilization.
[0009] Optionally, the material of the cooling layer is perfluorohexanone.
[0010] Optionally, the thickness of the cooling layer is greater than the thickness of the expansion layer.
[0011] Optionally, the expansion layer is made of a heat-conducting expansion material.
[0012] Optionally, the total thickness of the thermal insulation buffer pad is not greater than 3 mm.
[0013] Optionally, an adhesive layer is provided between the expansion layer and the temperature-reducing layer.
[0014] According to a second aspect of an embodiment of the present application, a battery is provided, comprising a plurality of battery cells and a thermal insulation buffer pad as described above, wherein the thermal insulation buffer pad is located between two adjacent battery cells, and the two outermost expansion layers of the thermal insulation buffer pad are respectively bonded to the surfaces of the two adjacent battery cells.
[0015] According to a third aspect of an embodiment of the present application, there is provided an electrical device comprising a battery compartment and at least two batteries as described above disposed in the battery compartment.
[0016] The beneficial effects of this application include:
[0017] The present application provides a thermal insulation buffer pad, comprising: an expansion layer and a cooling layer alternately stacked, wherein the number of the expansion layer is one more than the number of the cooling layer. The thermal insulation buffer pad is made of two materials alternately stacked, and the cooling layer is used to absorb the heat generated by the battery cell, reduce the temperature of the battery cell in time before the battery cell thermal runaway occurs, and inhibit the transfer of heat between the battery cells. The thermal expansion of the expansion layer can offset the deformation and compression of the thermal insulation buffer pad caused by the thermal runaway expansion of the battery cell, increase the distance between the runaway battery cell and the non-runaway battery cell, and help improve the energy density and thermal insulation capacity of the thermal insulation buffer pad. In addition, after the thermal expansion of the expansion layer, it can also reduce the expansion force between the battery cells, thereby better exerting the performance of the battery cell and improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 This is one of the structural schematic diagrams of the thermal insulation cushion provided in the embodiment of the present application;
[0020] Figure 2 This is the second structural schematic diagram of the thermal insulation buffer pad provided in an embodiment of the present application.
[0021] Icon: 100-thermal insulation cushion; 110-expansion layer; 120-cooling layer. DETAILED DESCRIPTION
[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application as claimed, but merely represents selected embodiments of the present application. It should be noted that, unless there is a conflict, the various features of the embodiments of the present application may be combined with each other, and the combined embodiments are still within the scope of protection of the present application.
[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0027] In the first aspect of the embodiment of the present application, referring to Figure 1 , provides a thermal insulation buffer pad 100, including: expansion layers 110 and cooling layers 120 alternately stacked, the number of expansion layers 110 being one more than the number of cooling layers 120.
[0028] The thermal insulation cushion 100 includes an expansion layer 110 and a cooling layer 120 . The number of cooling layers 120 is N, and the number of expansion layers 110 is N+1, where N=1, 2, 3, etc. The expansion layers 110 and cooling layers 120 are alternately stacked. The outermost two layers of the thermal insulation cushion 100 are both expansion layers 110 , with a cooling layer 120 sandwiched between every two expansion layers 110 .
[0029] The thermal insulation buffer pad 100 is made of two materials alternately stacked. Among them, the cooling layer 120 is used to absorb heat, and the expansion layer 110 is used to expand due to heat. When the thermal insulation buffer pad 100 is used in a battery, the thermal insulation buffer pad 100 is arranged between two adjacent battery cells. The cooling layer 120 of the thermal insulation buffer pad 100 is used to absorb the heat generated by the battery cells, reduce the temperature of the battery cells in time before the battery cells undergo thermal runaway, and suppress the transfer of heat between the battery cells. The thermal expansion of the expansion layer 110 of the thermal insulation buffer pad 100 can offset the deformation and compression of the thermal insulation buffer pad 100 caused by the thermal runaway expansion of the battery cells, increase the distance between the runaway battery cells and the non-runaway battery cells, and help improve the energy density and thermal insulation capacity of the thermal insulation buffer pad 100. In addition, after the thermal expansion of the expansion layer 110, it can also reduce the expansion force between the battery cells, thereby better exerting the performance of the battery cells and improving the performance of the battery.
[0030] Optionally, the cooling layer 120 absorbs heat by volatilization.
[0031] The cooling layer 120 works by absorbing heat through volatilization. In the event of high temperature or open flames, the cooling layer 120 automatically releases heat and rapidly absorbs heat to cool down and extinguish the fire. This allows for multiple fire extinguishing operations, preventing re-ignition and re-explosion.
[0032] Furthermore, the expansion force of the battery cells steadily increases during actual use, and only with appropriate preload can the battery cells fully perform. The cooling layer 120 is partially consumed during the cooling process, freeing up a small amount of space in the late stages of cell aging and early stages of thermal runaway to assist the expansion layer 110 in buffering. This increases the buffer space between cells and reduces the expansion force between cells, thereby enhancing the performance of the cells and improving battery performance.
[0033] Optionally, the material of the cooling layer 120 is perfluorohexanone.
[0034] Perfluorohexanone has a low boiling point and vaporizes quickly when the battery cell heats up, absorbing a large amount of heat and rapidly reducing the cell temperature, preventing thermal runaway. Furthermore, perfluorohexanone is colorless, odorless, and non-toxic. At high temperatures, it decomposes into water and carbon dioxide, causing no environmental pollution or harm to the human body. Furthermore, perfluorohexanone is relatively low-cost, making its use in batteries cost-effective.
[0035] Optionally, the thickness of the cooling layer 120 is greater than the thickness of the expansion layer 110 .
[0036] The cooling layer 120 absorbs heat through volatilization, which consumes heat during use and reduces in thickness. Setting the thickness of the cooling layer 120 greater than that of the expansion layer 110 can maximize the service life of the cooling layer 120 within a limited space, thereby extending the battery's service life.
[0037] During use, at least one expansion layer 110 is placed between the cooling layer 120 and the cell surface. To prevent the expansion layer 110 from blocking heat transfer to the cooling layer 120, the expansion layer 110 can optionally be made of a thermally conductive expansion material. Heat released by the cell is transferred through the expansion layer 110 and promptly absorbed by the cooling layer 120, thereby preventing the cell from overheating and potentially causing thermal runaway.
[0038] Optionally, the expansion layer 110 is made of silicone.
[0039] Silicone expands after absorbing heat and maintains its original state after cooling, allowing for repeated use, thus reducing production costs. Furthermore, silicone exhibits excellent properties such as high-temperature resistance, corrosion resistance, and aging resistance. These characteristics enable it to maintain stable physical and chemical properties in a variety of environments, thus ensuring its reliability and durability as an expansion material.
[0040] Optionally, the total thickness of the thermal insulation buffer pad 100 is no more than 3 mm.
[0041] It should be noted that the total thickness of the thermal insulation cushion 100 refers to the dimension of the thermal insulation cushion 100 in the direction in which the expansion layer 110 and the temperature reduction layer 120 are sequentially stacked.
[0042] Batteries typically include multiple cells, each of which requires a thermal insulation cushion 100. If the total thickness of the thermal insulation cushion 100 is too large, the battery volume will increase significantly. Therefore, setting the total thickness of the thermal insulation cushion 100 to less than or equal to 3 mm can effectively prevent thermal runaway of the cells and improve battery performance without significantly increasing the battery volume.
[0043] Alternatively, see Figure 2 , the number of expansion layers 110 is two, and the number of cooling layer 120 is one.
[0044] In other words, the thermal insulation cushion 100 has three layers: the two outer layers are expansion layers 110, and a cooling layer 120 is sandwiched between the two expansion layers 110. This configuration of the thermal insulation cushion 100 does not make the total thickness of the thermal insulation cushion 100 too large, and can maximize the thickness of the expansion layer 110 and the cooling layer 120 within a limited space, thereby achieving a better thermal insulation and buffering effect.
[0045] The thermal insulation cushion 100 is formed by alternating expansion layers 110 and cooling layers 120. When the expansion layers 110 and cooling layers 120 are relatively fixed, installation of the thermal insulation cushion 100 is facilitated. Therefore, an adhesive layer is optionally provided between the expansion layers 110 and cooling layers 120. The adhesive layer secures two adjacent expansion layers 110 and cooling layers 120 together, thereby forming the thermal insulation cushion 100 as a single unit.
[0046] In other embodiments, the expansion layer 110 and the cooling layer 120 may be fixed together by pressing, or the edges of the expansion layer 110 and the cooling layer 120 may be clamped and fixed in a frame.
[0047] The second aspect of this embodiment provides a battery, comprising multiple battery cells and a thermal insulation buffer pad 100 as described above, wherein the thermal insulation buffer pad 100 is located between two adjacent battery cells, and the two outermost expansion layers 110 of the thermal insulation buffer pad 100 are respectively bonded to the surfaces of the two adjacent battery cells.
[0048] A third aspect of this embodiment provides an electrical device, including a battery compartment and at least two batteries as described above disposed in the battery compartment.
[0049] The battery and the electrical device have the same structure and benefits as the thermal insulation cushion 100 in the aforementioned embodiment. The structure and benefits of the thermal insulation cushion 100 have been described in detail in the aforementioned embodiment and will not be repeated here.
[0050] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. A thermal insulation cushion, characterized in that: include: The expansion layers and the cooling layers are alternately stacked, and the number of the expansion layers is one more than the number of the cooling layers.
2. The thermal insulation cushion according to claim 1, wherein: The number of the expansion layers is two, and the number of the cooling layer is one.
3. The thermal insulation cushion according to claim 1, wherein: The cooling layer absorbs heat by volatilization.
4. The thermal insulation cushion according to claim 3, characterized in that: The material of the cooling layer is perfluorohexanone.
5. The thermal insulation cushion according to claim 4, characterized in that: The thickness of the cooling layer is greater than that of the expansion layer.
6. The thermal insulation cushion according to claim 1, wherein: The expansion layer is made of a heat-conducting expansion material.
7. The thermal insulation cushion according to claim 1, wherein: The total thickness of the thermal insulation buffer pad is not greater than 3 mm.
8. The thermal insulation cushion according to claim 1, wherein: An adhesive layer is further provided between the expansion layer and the temperature reduction layer.
9. A battery, characterized in that: It comprises a plurality of battery cells and a thermal insulation buffer pad as claimed in any one of claims 1 to 8, wherein the thermal insulation buffer pad is located between two adjacent battery cells, and the two outermost expansion layers of the thermal insulation buffer pad are respectively in contact with the surfaces of the two adjacent battery cells.
10. An electrical device, characterized in that: The invention comprises a battery compartment and at least two batteries according to claim 9 arranged in the battery compartment.